570 



PROCEEDING!^ OF THE NATIONAL MUSEUM. 



vol.. XXV. 



The lower elements of the shoulder girdle form a wide plate. The 

 loAver part of the clavicle is widened and the hypocoracoid is separated 

 from it for most of its length by a large space, which is inclosed below 

 by two small slender spurs, one reaching backward from the clavicle 

 and another reaching forward from the hypocoracoid. The upper 



a actinosts. 



d clavicle. 



fiyc hypercoraeoid. 



Injpc hypocoracoid. 



pel postclavicle. 



part of the hypocoracoid is connected to the clavicle by a rather short 

 dentate suture. A thin crest springs from the posterior edge of the 

 hypocoracoid and curving backward forms a small channel behind it. 

 About half of the hypercoraeoid is al)ove the hypocoracoid and half 

 above the lower lamina of the clavicle. The opening through its cen- 

 ter is large. 



